spring scales

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Transcript of spring scales

i.e.; If 1 pound stretches the spring 5 inches, 2 pounds will stretch it 10 inches. A spring scale determines the weight of an object. The spring reaction to weight remains constant and will change only if the weight changes. The scale measures weight by the distance a spring changes under different weights. People use it for mostly trading and science. food Portable wiseGeek.com Walburg, Mickey. "Advantages & disadvantages of spring scales." People could measure the weight ofof food to determine the cost of their goods.The seller would weigh the food to set a price.A seller would also sometimes weigh the object,minerals etc to see how much they where worth. This made it much more hard to be unfair with there trades. letters & packages The post office can weigh anypackage or letter to be sure it is safe to ship or travel. (www.Wikipedia.com) 1) economics- Weighing mail became easierbecause they could take the scale with them in the mail room and saved them time and money. 2) culture factors- It increased correspondence andhelped people share more info. Affordable The scales where easy to makeand cheap to buy. If you where afarmer or a seller, you could probably afford a spring scale. Minerals(gold, silver, etc... In some places, people traded minerals. The traderwould need to weigh the minerals to see the value. The spring scale is not too big which makes traveling with it easier. If you where a world wide seller, you could carrya spring scale wherever you go. socially: Because everyone can afford it,they are getting out farther and using with more people than before. culturally: It increased trade and affected there traditionsby bringing people more available goods. How has the spring scale changed overtime? The spring scale is part of a very large group of scales each of which are more modern than the last. One of the first scale was probably a balance scale. Over the years scales got more complex. Now we have scales that are electronic. You can buy an electric scale for weighing yourself for example. http://www.google.com/imgres?q=electronic+scale&num=10&hl=en&biw=1366&bih=673&tbm=isch&tbnid=tr0g_kE6fSyrVM:&imgrefurl=https://sites.google.com/a/maricopa.edu/diamante/home/chemistry-1/lab-report-2-cheetos&docid=oeVyq0l7mq0BmM&imgurl=http://upload.ecvv.com/upload/Product/20093/China_Electronic_scale_ES_H_series20093241731398.jpg&w=361&h=373&ei=tOphUKirKoHJtAb68ICIDQ&zoom=1&iact=hc&vpx=637&vpy=316&dur=1752&hovh=228&hovw=221&tx=126&ty=141&sig=117572769872959176758&page=1&tbnh=146&tbnw=153&start=0&ndsp=21&ved=1t:429,r:10,s:0,i:118 http://www.google.com/imgres?q=balance+scale&num=10&hl=en&biw=1366&bih=673&tbm=isch&tbnid=o5LTxKA-A_LSmM:&imgrefurl=http://smecheerleader1994.wordpress.com/2010/02/01/balance/&docid=Q0nFC9JvDIhZpM&imgurl=http://smecheerleader1994.files.wordpress.com/2010/02/balance_scale.jpg&w=380&h=375&ei=S-thUJyFKMbJtAbFnICAAw&zoom=1&iact=hc&vpx=891&vpy=170&dur=471&hovh=223&hovw=226&tx=168&ty=135&sig=117572769872959176758&page=1&tbnh=137&tbnw=145&start=0&ndsp=18&ved=1t:429,r:4,s:0,i:151 http://www.google.com/imgres?q=spring+scale&num=10&hl=en&biw=1366&bih=673&tbm=isch&tbnid=wDQVbIM0uJvv9M:&imgrefurl=http://www.xump.com/science/Tubular-Spring-Scale-Brown1000g.cfm&docid=sQqERdjijaZhCM&imgurl=http://www.xump.com/Images/Products/Tubular-Spring-Scale-Brown1000g-500A.jpg&w=500&h=500&ei=1uxhUKmlCsTWsgaZhIGIBA&zoom=1&iact=hc&vpx=474&vpy=166&dur=89&hovh=225&hovw=225&tx=117&ty=122&sig=117572769872959176758&page=1&tbnh=130&tbnw=130&start=0&ndsp=22&ved=1t:429,r:2,s:0,i:145 http://www.google.com/imgres?q=weighing+minerals&hl=en&sa=X&biw=1366&bih=673&tbm=isch&tbnid=rDv3NHaA0Ob8aM:&imgrefurl=http://www.chemistryland.com/CHM130FieldLab/Lab3/Lab3.html&docid=gBSreEkuT7Es8M&imgurl=http://www.chemistryland.com/CHM130FieldLab/Lab3/MassOfGoldMineral.jpg&w=512&h=317&ei=M-9hUJ_-JcrEswbz_4CQCw&zoom=1&iact=hc&vpx=378&vpy=399&dur=124&hovh=177&hovw=285&tx=123&ty=152&sig=117572769872959176758&page=1&tbnh=123&tbnw=199&start=0&ndsp=18&ved=1t:429,r:13,s:0,i:111 thank you forwatching!! thank you for watching!!